Add rule documentation for new rule

Author: yutingc

RuleDocumentation/AvoidUsingDeprecatedManifestFields.md

@@ -0,0 +1,27 @@
+#AvoidUsingDeprecatedManifestFields	
+**Severity Level: Warning**
+
+
+##Description
+
+PowerShell V5.0 introduced some new fields and replaced some old fields with in module manifest files (.psd1). Therefore, fields such as "ModuleToProcess" is replaced with "RootModule". Using the deprecated manifest fields will result in PSScriptAnalyzer warnings.
+
+##How to Fix
+
+To fix a violation of this, please replace "ModuleToProcess" with "RootModule".
+
+##Example
+
+Wrong： 
+```
+ModuleToProcess ='psscriptanalyzer'
+
+ModuleVersion = '1.0'
+```
+
+Correct: 
+'''
+RootModule ='psscriptanalyzer'
+
+ModuleVersion = '1.0'
+'''